Synthesis and complexation of a new facultative tridentate S2Te donor ligand MeS(CH2)3Te(CH2)3SMe: crystal structures of [Rh(Cp*)(S2Te)][PF6]2 and [PtCl(S2Te)]PF6

The syntheses and spectroscopic characterisation of the new facultative tridentate tellurium containing ligands MeS(CH2)3Te(CH2)3SMe (S2Te) and H2N(CH2)3Te(CH2)3NH2 are described. The complexes of the former, fac-[Mn(CO)3(S2Te)]CF3SO3, [Rh(Cp*)(S2Te)][PF6]2, [MCl(S2Te)]PF6 (M=Pd or Pt), [Cu(S2Te)]BF4 and [Ag(S2Te)]CF3SO3 have been prepared and characterised by analysis, IR, 1H-, 13C{1H}-, 125Te- and 195Pt-NMR spectroscopy and mass spectrometry. The X-ray crystal structures of [Rh(Cp*)(S2Te)][PF6]2 and [PtCl(S2Te)]PF6 are described. The results are compared with those obtained from complexes of the related tridentates Te{(CH2)3TeR}2, Se{(CH2)3SeMe}2 and S{(CH2)3SR}2.